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SPIRAL DRILL COLLAR x 15 pcsOD: 6 1/4ID: 2 1/4OVERALL LENGTH : 31CONNECTION TYPE : 3 1/2 IF PIN-3 1/2 IF BOXPROTECTORS: CAST STEELHANDLING PARTS: W/ SLIP AND ELEVATOR RECESSES. ELEVATOR RECESS DIAMETER : 5 5/8. SLIP RECESS DIAMETER 5 3/4. ELEVATOR RECESS RADIUS: 1/8SPEC: API SPEC 7SPIRAL DRILL COLLAR x 20 pcsOD: 4 3/4ID: 2OVERALL LENGTH : 31CONNECTION TYPE : 3 1/2 IF PIN-3 1/2 IF BOXPROTECTORS: CAST STEELHANDLING PARTS: W/ SLIP AND ELEVATOR ***** RECESS DIAMETER : 4 1/4. SLIP RECESS DIAMETER 4 3/8. ELEVATOR RECESS RADIUS: 1/8SPEC: API SPEC 7 driil collar wellhead equipments