Features: - Replacement step drill bit fits for manual-pocket hole system. - Drill bit for use with pocket hole joinery. - Drilling steady, high efficiency, hole wall is smooth and chip evacuation unobstructed. - Polished surface finish, good finish. - Removed chip fast, drilling hole fast . - Bit is suitable for drilling wood, plastic, soft metal aluminum and iron etc. - Dedicated to open the sliding door frame hole, for door frame processing, sliding door mullion processing, iron products, auminum alloy, wood, light alloy processing. Specification: Material:High Speed Steel Model:4-8,5-9,5-10,6-10,8-12 Overall length:117-151mm Color:as picture show Quantity:1PC Mainly used for wood, MDF, MDF, particleboard opening hole. Package Included: 1 x step drill bit Note: Transition: 1cm=10mm=0.39inch. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.