Master Grippers MDP® Master Tappers® Master Drillers® Master Drillers® Plymetal Master Nylon Headed® Machine Screws Master Purlin/Girt Bolts Girt Safety Spacer Nut Fin Neck Locking Bolts A-325 Heavy Hex Structural Bolts Capscrews Nuts & Washers Master Flash® Closure/Venting Tube Caulking & Butyl Tape Master Surface Drive Bits® Stainless Steel Guidelines (PDF) How to Specify Fasteners (PDF) Stainless Steel Guidelines (PDF) MASTER SURFACE DRIVE BITS MAGNETIC SURFACE DRIVE BITS WITH LOBULAR SOCKET New lobular socket design provides superior strengthLobular design prevents rounding of nylon fasteners and helps protect finishesMagnet depth can be pre-set to accommodate head heightPowerful earth magnet holds fastener for wobble-free drilling or tapping MASTER SURFACE DRIVE INSERT BITS SQUARE DRIVE INSERT BITS - NON MAGNETIC MASTER PHILLIPS INSERT BITS PHILLIPS DRIVE INSERT BITS - NON MAGNETIC MASTER QUADREX DRIVE INSERT BITS QUADREX DRIVE INSERT BITS - NON MAGNETIC