(14) 10mm BOLT ON, a 10mm diameter threaded tube supplied complete with two polished brass washers (21mm o/d), brass nuts and fibre backing washers. Also purchase reducer, item [33], when using with 1/2" threaded lampholders. 10mm x 1” Order Ref. 1/25 – £1.55p 10mm x 2” Order Ref. 1/50 – £1.63p 10mm x 3” Order Ref. 1/75 – £1.76p