Design Their simple design and compact size make it easy to carry the tool in your tool bag. Quickly slip it into your hand drill and start mending parts. Operation is simple: use the lowest speed on the bit, then apply light pressure to remove the burr. Effective on stainless steel, hardened steel, mild steel, copper, brass, aluminum, fiberglass, wood, plastic. Fits size : 8-32 bolts (.164) up to 3/4″-10 (.750)- (4mm -19mm). Quickly attach bolts and tighten nuts in place . Simplifies the repair process, eliminating the need to replace expensive or hard-to-find hardware. Simple to use, using the minimum speed of the drill, then applying light pressure to remove the burr. Effective on stainless steel, hardened steel, soft steel, copper, brass, aluminum, fiberglass, wood, plastic. High strength and hardness. Features: Material: stainless steel. Color: silver, black. Product size: 2.2 x 2.5cm. Suitable for sizes: 8-32 bolts (.164) up to 3/4 & Prime; -10 (.750) - (4mm-19mm)Proper Use: This tool works by shearing metal layer by layer. Slow speed, with no unnecessary cutting and the use of cutting oil or other lubricant will bring it a long service life. Content : 1 x external chamfer tool.Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received Delivery quantity: (according to the main picture)