The BlueSpot 6-piece Broken Bolt and Screw Extractor Set is an essential tool for removing damaged, stripped, or broken screws and bolts. Manufactured from hardened alloy steel, these extractors use reverse threading to grip and remove stubborn fasteners that conventional tools cannot handle.Key Specifications: Model: 22308 Set contents: 6 extractors in 5 different sizes Size range 1: 3.1-6.3mm (1/8"-1/4") - 1 piece Size range 2: 6.3-7.9mm (1/4"-5/16") - 1 piece Size range 3: 7.9-11.1mm (5/16"-7/16") - 1 piece Size range 4: 11.1-14.2mm (7/16"-9/16") - 1 piece Size range 5: 14.2-19mm (9/16"-3/4") - 1 piece Material: Hardened alloy steel for durability Thread type: Deep reverse thread for secure extraction Shank type: 1/4" hex shank for power bit adaptors Weight: 0.14kg Package dimensions: 16cm x 11cm x 2.2cm Barcode: 5028734223088 Warranty: Lifetime guarantee available