I've got a set of WERA like those the slightly concave flats really help grip the bolt. Have yet to strip a allen bolt with them (used to all the bloody time). One of my better tool purchases. http://www.diytools.co.uk/diy/Main/sp-2-3103-59838-wera-stainless-steel-ballpoint-hex-key-9-piece-clip.asp?iCategoryID1=3103
erm..........20 quids up there^^
@31trum started
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erm..........20 quids up there^^