Irwin bolt fastener remover expansion set 5 piece 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 universal lobular design for all types of fasteners sizes 516in 10mm 13mm 1116in and 34in