Specifications Material: Carbon Steel Color: Silver, Gold Woodworking Chamfer: High speed steel. Shank feature: 1/4" Hex Shank Quantity: 6Pcs Package Included: 1Pc 5 Countersink Drill Bit 1Pc 6 Countersink Drill Bit 1Pc 8 Countersink Drill Bit 1Pc 10 Countersink Drill Bit 1Pc 12 Countersink Drill Bit 1Pc L-wrench Features 1. Standard 1/4 Inch hex shank is quick change compatible. 2. Adjustable counter sleeve depth with allen wrench. 3. Special designed steel counter sleeve countersinks or counterbores pilot hole. 4. Heat treated, tempered and durable high speed steel for superior cutting power. 5. Faster discharge of sawdust, you will get a nice smooth surface on any type of hard, soft wood or aluminum. 6. Suitable for soft metal, insulation board, PVC board, wood board, etc. Notes 1. Please allow slight measuring deviation due to manual measurement. 2. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you 3.Please leaving a message before you give the bad feedback, if the products have some problems.Thanks for your understandings.