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. Mounting mandrel materials: Made of A3 carbon steel with black plating, which is durable and long lasting, lightweight at 50g for easy working. 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. 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. Warranty: We provide a 100% satisfaction guarantee for any unsatisfactory experience. 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.