Facom 1/2" Drive Long-Reach Convex 6-point Socket - 30mm. - Impact socket...suitable for use with air tools. Thin wall (OD=39.0mm) for better access. Convex design contacts bolts and nuts on the flats rather than points. For BMW car and motorcycle applications....this socket is 1mm thinner than the S.30LA that I've been selling for BMW automotive output flange nut applications. Also reported to be useful with BMW K1200 clutch pack R&R.