Specifications: This is a home woodworking keyhole opening tool. It has solid high hardness carbon steel shank body with plastic-sprayed surface. Fine workmanship router bit is very durable to use. Item Name: Router Bit Head Material: YG6 Alloy Body Material: 45# Carbon Steel, Plastic-sprayed Surface Features: Durable, High Hardness, Wood Cutting Tool 1/4*3/8 Size: 4.6cm x 0.952cm x 0.635cm/1.81" x 0.37" x 0.25" (Approx.) 1/4*1/2 Size: 4.6cm x 1.27cm x 0.635cm/1.81" x 0.5" x 0.25" (Approx.) 1/2*1/2 Size: 4.8cm x 1.27cm x 1.27cm/1.89" x 0.5" x 0.5" (Approx.) 1/2*3/8 Size: 4.6cm x 0.952cm x 1.27cm/1.81" x 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 Router Bit