Crain Swivel-Lock Driving Head CompleteSwivel Lock Driving Head Complete includes the driving head only for our swivel head stretcher. The swivel head has 60 of free swivel for patterned carpet. Depress the built in lock pin, and you can lock the swivel in 5 positions. Lock in the straight position for square stretching, or at 15 for most angle stretching. Theres even a 30 setting for extreme angles found in L shaped living dining rooms. Swivel Lock Driving Head push button stretch lock is