For the removal of damaged, rusted, rounded off nuts and bolts and for removing rusted screws in hard to reach places Includes 12 x 3/8in. Diameter specialist sockets (mm): 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 Plus 4 x 36mm long bits Ph2/Ph3, Flat 8/10mm, 2 x 80mm long bits Ph2, Flat 8mm and 1 x 5/16in. bit adaptor The sockets have a fluted design and are suitable for AF/Metric sizes They can be used with the impact driver provided or with 3/8in.D ratchets and power bars Packed in a high quality blow moulded case with metal clip, eva foam with a wipe clean surface