Description: 【Eccentric Drill Bit Design】: This set of drill bit features a special alloy cutter head design for faster eccentric drilling. The unique design ensures precision positioning and high hardness. 【Wide Spiral Chip Removal Groove】: The widened spiral chip removal groove effectively prevents chip accumulation at the drill mouth, preventing blade burnout and allowing for fast chip removal during high speed operation. 【Standard Hexagonal Handle】: The standard hexagonal handle design ensures a firm grip without loosening, effectively preventing the drill bit from slipping. 【Versatile Use】: These drill bit are suitable for use with hand drill, cordless drill, and bench drill. They offer wide applicability and are easy to operate. 【Water Assisted Drilling】: To avoid damage to the drill bit when drilling hard objects, water can be added during the drilling process to reduce the risk of damage. Specification: Material: Alloy 【Note】: For drilling holes, add water; when drilling deep holes, repeatedly remove chips to prevent burning or breaking of the drill bit. Not recommended for use with lithium drill below 18V as they may not have enough power. When drilling marble , porcelain tiles, stainless steel cooling is required by adding water; otherwise it may easily burn out. If you encounter rebar while drilling into walls change position as rebar can cause blade chipping. Size Chart: Specification 6mm: total length 95mm, working length 55mm, weight 0.016kg Specification 8mm: total length 95mm, working length 55mm, weight 0.022kg Specification 10mm: total length 95mm, working length 55mm, weight 0.032kg Specification 12mm: total length 95mm, working length 55mm, weight 0.035kg Package Includes: 1 Set Crooked Tip Eccentric Drill Bit(5 Pack) Note: Please allow slightly errors 1-2cm differences due to manual measurement.