Wide Applications:counter drill bit is a standard bit with all size to meet you need,could make a nice Press for wood projects or work in most quick disconnect adapters like wood window or door tapping etc Accurate Tool:Adjustable design allows you to replace drill easily. And Its Spring loaded outer guide with chamfered keeps the high-speed drill centered to create perfect pilot holes,They make alignment of holes so much easier and you can get center every time :can make a clean accurate counter hole. fairly hard and solid. to send counter drill bit as a gift for your father, or husband colour:Silver Material:steel size:5/64 inch,7/64 inch,9/64 inch,11/64 inch,5mm,13/64 inch,1/4 inch Package Contents: 7*door and window hinge hinge hole opener Please Note: Choose low speed when drilling, it is recommended 2000R/min -3000R/min, If too fast, self centering drill bit may fail to centering and get broken Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.