QUALITY MATERIAL: Made of carbide tipped material of ultra-sturdiness, durability for years. SIMPLE TO USE: Simple operation, easy to use, and fast perforated. WIDE USE: Used for drilling walls, stones, bricks, or installation of air-conditioning etc.. SPECIAL SHANK DESIGN: Special direct system shank, male thread adapter, replace the broken adapter with drill chuck. WELDING TECHNOLOGY: High-frequency welding technology, welding openings is very strong, smooth inside and outside welding mouth. Notice: In order to make the locking screw more stable on the drill and for your safety, please to use it as the clockwise when you drill the wall holes.