General description Neilsen 11pc Star Fixings Screw Bolt Extractor Drill Bits Set is ideal for loosening and opening screws and bolts that are damaged or worn off. Technical specifications 7pcs 1/4" D x 50mm long for Star fixings: T10, T15, T20, T25, T27, T30, T40 2pcs 10mm x 38mm long extractor bits: T45, T50, T55 1pc 1/2" D x 10mm Bit Adaptor Material: S2