Features: Brand new and high quality Selecte from carbon steel, the surfaced is anodized, strong. This extension rod design to convert electric drill to Grinders wheel. Just a small extension rod, electric drill can create a new Grinders wheel, which is cost saving. Great workmanship, with strict control and quality assurances. Smooth surfaced and nice polishing, neat and generous, no need to worry about harming your hand. Specifications: Material:Carbon Steel Type:5mm/6mm/8mm/10mm/12mm/14mm/16mm 5mm:Approx.5.8x0.50cm/2.28x0.2inch 6mm:Approx.6.8x0.6cm/2.68x0.24inch 8mm:Approx.6.8x0.8cm/2.68x0.31inch 10mm:Approx.6.8x1cm/2.68x0.39inch 12mm:Approx.6.8x1.2cm/2.68x0.47inch 14mm:Approx.6.8x1.4cm/2.68x0.55inch 16mm:Approx.6.8x1.6cm/2.68x0.63inch Package Includes: 1 Set Spindle Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.