【High Quality Material】--Made of forged chrome vanadium steel with high hardness, these bolt extractors are sturdy and durable. 【Compatibility】-- These Remover Extractor tools can be driven with a metric spanner or socket for fast work. 【Bolt Extractor Socket Set】-- This is 11 pieces nut remover set that can be used with a combination wrench adjustable for removing damaged, stripped, rusted, or stuck fasteners (screws/nuts/bolts) of all types of the wrenches, pliers, vise grips, or socket. You can unscrew the rusted bolt more easily. 【Including a Punch Tool】--This set includes a unique tool to help extract the damaged fastener from the socket. The spiral socket design allows a secure connection to the rounded-off fastener to be extracted. 【Application】--These Locking Socket Tools fit hex heads sized 9, 10, 11, 12, 13, 14, 15, 16, 17, and 19mm, and fit outside hex sizes 16mm,16mm, 17mm, 19mm, 19mm, 21mm, 22mm, 24mm, 24mm, 27mm., Manufacturer: LSDZHK