The Eastwood 5/16” Spot Weld Drill makes drilling out spot welds for panel removal a less tedious and much safer job! Makes spot-weld drilling safer, faster and much easier Automatic bit advance feature with sturdy backing hook Precise cutting depth adjustment allows drilling through outer panel only with no damage to underlying panel Quick bit replacement. It features an automatic bit advance feature with positive spot weld cutting depth adjustment and a removable backing hook. The set-screw drill bit retaining design provides convenient and secure cutting bit changes. Contents: (1) 5/16” Bit (1) ¼” MNPT Quick Connect Air Fitting (1) Bit Retaining Screw Wrench Complete Instructions Uses # 31266 Replacement Bits Specifications: Spot Weld Capacity 1/4\" & 5/16” Air Consumption 4 cfm RPM 1,600 free speed Maximum Inlet Air Pressure 90 psi Inlet thread size 1/4” FNPT.