Multi-Spline Screw Extractor Set Hex Head Bit Socket Wrench Bolt Remover 25Pcs. Sizes: 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm. The bi-hex profile lets you position the adaptor on the fastener so that you can keep the adaptor in line with the wrench for accurate torque setting.