Features: Brand new and high quality Made of high-speed steel, the surfaces is anodized, strong and durable. This extension rod is designed to convert electric drill to grinding wheel. Just a small extension rod, electric drill can create a new grinding wheel, which is cost saving. Great workmanship, with strict quality control and quality assurances, high safety factors, can be used with peace-of-mind. Smooth surfaces and nice polish, neat and generous, no need to worry about harming your hand. Specifications: Material:Steel Type:5mm/6mm/8mm/10mm/12mm/14mm/16mm 5mm:Approx.60x15x5x9.5mm/2.36x0.59x0.19x0.37inches 6mm:Approx.60x15x6x9.5mm/2.36x0.59x0.23x0.37inches 8mm:Approx.69x15x8x9.5mm/2.7x0.59x0.31x0.37inches 10mm:Approx.69x18x10x9.5mm/2.7x0.7x0.39x0.37inches 12mm:Approx.69x18x12x9.5mm/2.7x0.7x0.47x0.37inches 14mm:Approx.70x20x14x9.5mm/2.75x0.78x0.55x0.37inches 16mm:Approx.70x22x16x9.5mm/2.75x0.86x0.63x0.37inches Wrench:Approx.53x19mm/2.08x0.74inches Package Includes: 1 Set Spindle Adapter note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.