Function Design：THMMN 3in Cut-Off Wheels designed for cutting various metal, plastic, wood, acrylic etc, for both metalworking professionals and DIYers. Compatible Devices：These cutting wheels with 1/4" shank mounting mandrel compatible with most brand Die Grinder, Air and Electric Cut Off Tools. The 3in small size cutter wheel with small compatible machine ideal for tasks of hard reach place compare with 4.5in. Premium Material Component: THMMN cutting discs are made of resin combine brown corundum and alumina abrasive #60 grits, to ensure extra toughness, sharpness, and durability. 3/64” thickness provides fast, precise, and clean cutting performance with minimal burrs and material waste. High Performance：This metal cutting discs can cut 12mm solid stainless steel sticks approx 200times, comply with international standards and safety requirements such as EN 12413. NOTICE: To prevent injury, be sure to wear proper eye, face, body and respiratory protection, keep all guards in place. 4. 2 Type Mounting Screw Heads: 3/8in & 1/4in 2size mandrel mounting heads arbor, suitable for more work scenario, widely using purpose, according to your work project to chose. 2set pack allow you can mount different wheels for cutting/grinding/polishing purpose in the same work progress, avoid change the mandrel frenquently! Quite valueable package! RPM: max 20380 Function Design：THMMN 3in Cut-Off Wheels designed for cutting various metal, plastic, wood, acrylic etc, for both metalworking professionals and DIYers. RPM: 20380 Compatible Devices：These cutting wheels compatible with most brand Die Grinder, Air and Electric Cut Off Tools. The 3in small size cutter wheel with small compatible machine ideal for tasks of hard reach place compare with 4.5in. Application Scenarios：This aggressive cutting wheel widely used in building, ship engineering, manufactory workshops, power generation industry, automobile maintenance etc. Also for home toolroom DIY. Premium Material Component: THMMN cutting discs are made of resin combine brown corundum and alumina abrasive #60 grits, to ensure extra toughness, sharpness, and durability. 3/64” thickness provides fast, precise, and clean cutting performance with minimal burrs and material waste. High Performance：This metal cutting discs can cut 12mm solid stainless steel sticks approx 200times, comply with international standards and safety requirements such as EN 12413. NOTICE: To prevent injury, be sure to wear proper eye, face, body and respiratory protection, keep all guards in place. 1. Cut-Off Wheel Mandrel: The cutting wheel mandrel fit for 3/8in & 1/4in arbor hole cutter wheel, screw head length fits 0.035" to 1/4" thick Type 1 cut-off wheels. Also be used to same arbor grinding, sanding, cleaning, descaling, polishing wheels or circular saw blades. 2. Mounting mandrel materials: Made of A3 carbon steel with black plating, which is durable and long lasting, lightweight at 50g for easy working. 3. Compatible tools: The shaft mandrel is 1/4in stem ideal for die grinder, most hand drills, and any other rotary tools which accepts a 1/4” shank stem mandrel, is an ideal rotary tool accessories. 4. 2 Mounting Screw Heads: 3/8in & 1/4in 2size mandrel mounting heads arbor, suitable for more work scenario, widely using purpose, according to your work project to chose.