Specifications: This is a home woodworking keyhole opening tool. It has solid high hardness carbon steel shank body with plastic-sprayed surface, which is extremely durable to use. This product is widely used for wood slotting, hook opening, photo frame opening. The 1/4" shank type is suitable for employed in European and American countries such as United States, Britain, French and so on. The 6mm shank type is appropriate for using in countries like Russia, Germany, Spain, Pakistan, etc.. Item Name: Router Bit Quantity: 1/3Pcs(Optional) Head Material: YG6 Alloy Body Material: 45# Carbon Steel, Plastic-sprayed Surface Features: Durable, High Hardness, Wood Cutting Tool 1/4" x 5/16" Size: 0.63cm x 0.78cm/0.25" x 0.31" (Approx.) 1/4" x 3/8" Size: 0.63cm x 0.93cm/0.25" x 0.37" (Approx.) 1/4" x 1/2" Size: 0.63cm x 1.27cm/0.25" x 0.5" (Approx.) 6mm x 5/16" Size: 0.6cm x 0.78cm/0.37" x 0.31" (Approx.) 6mm x 3/8" Size: 0.6cm x 0.93cm/0.37" x 0.37" (Approx.) 6mm x 1/2" Size: 0.6cm x 1.27cm/0.37" x 0.5" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x 1/4"/6mm Router Bit Or 3 x 1/4"/6mm Router Bits (1Pc for Each Size)