Features: - Manufactured with hardened heat resistant and positive rake 50# steel teeth welded to a durable alloy backing and cap. - Exceptionally strong, safe, and shatter resistant. - Effectively and economically cuts a wide variety of materials .including Aluminum Sheet, Plastic, Wood. - Allows cutting through a depth 25mm (for wood). Specification: Material: 50# steel Process: serrated high temperature quenching Hardness: HRC48-50 degrees Depth: working depth 25mm Application: gypsum board, thick wood, plastic Drill Diameter Size: 19, 22, 25, 28, 32, 38, 44, 54, 64, 76, 89, 102, 127mm Color: yellow Packing included: 13 x Holesaw Drill Bit 1 x 3/8" mandrel 1 x 1/4" drill bit (2" long) with mandrel 1 x Drive plate 1 x Hex wrench Note: 1. Please allow 1-3cm (0.4-1.18") difference due to manual measurement and slight color variation for different display setting. 2. Due to the light and screen difference, the item's color may be slightly different from the pictures. Please understand.