TEKTON 1660 Combination Wobble Extension Bar Set, 9-Piece Two-in-one design functions as a straight extension for added length or a wobble offset extension to reach around obstructions Knurled band offer a nonslip grip for turning loosened fasteners by hand Spring-loaded detent balsl securely latches onto sockets, preventing them from being dropped Detent notches in drive end lock onto ratchets and breaker bars Made of premium chrome vanadium steel with a mirror chrome finish