Irwin bolt grip fastener remover 5 piece base set ideal for removing rounded rusty or painted bolts unique reverse spiral flute design securely grips and removes stubborn nuts and bolts can be used with a hand ratchet 38 in square drive and has hexagon flats for use with a spanner or adjustable wrench sizes 9 38in 11 716in 13 12in 14 916in and 15mm 58in supplied in a carrying case