Tecwerk Allen key width across flats 2.5 mm short 56 x 18 mm4T450258
Tecwerk Allen key width across flats 3 mm long, ball end 126 x 20 mm5B517608
Tecwerk Allen key width across flats 4 mm short 70 x 25 mm1R818036
Tecwerk Allen key width across flats 5 mm long 160 x 28 mm2E803044