The spline sockets allow this 50 piece set to grip multiple types of fasteners and work on a variety of bolts, including hex, star, square, splined and damaged heads, explains the provider Jie Yang. This go-through ratchet handle is designed to match the 1/4", 3/8", 1/2" Dr Quick Release ratchet adapter. All tools are in just one small case which saves space and is easily carried. http://jieyang.imb2b.com/