Klein Tools' small flip impact socket adapter is a must have for all tradesman. The 1/4 to 1/4 in hex adapter is designed for use with the Klein Tools large flip impact socket adapter (Cat. No. 66078) for dual-drive capability. When combined with Klein Tools' flip impact socket set, it provides even more versatility with five available socket sizes with which to work. Klein® 66079 Flip Impact Socket Adapter, 4140 Steel, Small, 2.5 L x 0.126 H x 0.126 W in