3/16 x 7 Inch HAMMER DRILL BIT SDS-PLUS TAPCON TO FIT TAPCON FITTING SYSTEM DRIVE & DRILLING. Tapcon SDS-plus Hammer Drill Bits with Professional qualities under ANSI standard Tapcon system. *Tapcon SDS-plus Hammer Drill Bit are made for professional quality only to drill various concrete, bricks, masonry materials, etc.to fit Tapcon hex fixing system. *Super quality carbide is taken for most durable drilling performance. Auto-copper soldering is under German tech. guaranteeing the best advantages in drilling. *Automatic-copper-soldering guarantees best welding strength and copper wrapping carbide for prolonged drilling life. Over 1200centidegree soldering temperature guarantee the drill bit fitting different working environments. *Ceratizit carbide tip for extra long drilling life in those rough concrete, masonry building materials,etc.