3 in Cut Off Wheels 25pc Kit with Mandrel - Durable Metal Cutting

In this review the SI FANG 25pc 3 in cut off wheels kit is assessed for workshop users who need a ready supply of small rotary cutting discs. The bottom line: this kit is best for hobbyists, fabricators and maintenance techs who want economical, long-lasting discs and a universal mandrel in a compact pouch. The reviewer found the single crystal corundum discs cut aggressively and the included A3 carbon steel mandrel holds up under regular use, making the set a practical add-on to a die grinder or 3/8 in arbor angle tool.

Key Features

• Kit contents: The set includes 25 3 in cut off wheels plus a 3/8 in and 1/4 in arbor shaft mandrel and a carry pouch for neat storage and portability.
• Universal mandrel: The mandrel offers two thread sizes so the shaft fits most 1/4 in drills and 3/8 in arbor grinders, reducing time spent swapping hardware.
• Durable abrasive: Wheels are made from single crystal corundum and calcined corundum for high hardness and abrasion resistance during repetitive cuts.
• Wide material use: Discs cut through steel, stainless, aluminum, fiberglass, plastic and wood, making them useful across metalworking and general repairs.
• High speed rating: Each 3 in wheel is rated for up to 25,000 RPM and 80 m/s, suitable for most die grinders and rotary cut off tools.
• Carry pouch: The included pouch keeps discs and the mandrel together for jobsite convenience and reduces the chance of losing small parts.

Who It's For

This kit suits DIYers, maintenance workers and small fabrication shops that need a large quantity of replacement cut off wheels for frequent light to medium cutting tasks. The mandrel compatibility with 1/4 in and 3/8 in chucks makes it a versatile choice for those who use a mix of die grinders and compact angle tools.

Those doing heavy industrial cutting, precision machining or work requiring thicker, reinforced wheels should look elsewhere for specialty or bonded metalcutting discs designed for sustained high-pressure use. For everyday shop and field repairs, this kit is a practical, cost-effective option.

Pros & Cons

Pros

• Good value: 25 discs plus a mandrel and pouch deliver extended runtime before reordering is needed.
• Durable construction: abrasive composition gives solid cutting life and resistance to chipping.
• Versatile mounting: included 3/8 in and 1/4 in fit most small grinders and drills without extra adapters.
• Portable: the carry bag makes it easy to transport and store the set on site.

Cons

• Thin discs: at 1.2 mm thickness they are not intended for heavy structural cutting and may wear faster under high pressure.

Specifications

Wheel diameter	3 in (75 mm)
Wheel thickness	1.2 mm (3/64 in)
Arbor compatibility	3/8 in (9.5 mm) arbor; 1/4 in shank mandrel included
RPM rating	Up to 25,000 RPM (80 m/s)
Abrasive material	Single crystal corundum & calcined corundum
Mandrel material	A3 carbon steel with black plating
Kit contents	25 wheels, 1 mandrel (3/8 in & 1/4 in), 1 carry pouch

Our Verdict

The SI FANG 25pc 3 in cut off wheels kit is a sensible purchase for hobbyists and tradespeople who need a bulk supply of reliable small cut off discs and a universal mandrel. It balances cutting performance, portability and value, though the thin 1.2 mm wheels are best for light to medium tasks rather than heavy structural cutting.

Frequently Asked Questions

Will these fit my die grinder?
Yes, the kit includes a mandrel for 1/4 in shanks and the wheels fit 3/8 in arbors, making them compatible with most die grinders and small angle tools.

What materials can they cut?
The wheels are rated for metal, stainless steel, iron, aluminum, fiberglass, plastic and wood for fast, burr free cutting in common repair and fabrication tasks.

Are the mandrel and wheels rust resistant?
The mandrel uses black plated A3 carbon steel for corrosion resistance and the wheels are abrasive ceramic based, which do not rust like metal discs.