This special part will enable you to attach home made parts or adapted parts such as cams, strips, dics and gears etc., simply drill an 8mm hole in your part and attach to the boss with the brass nut provided, these have a longer threaded section to enable you to fix on thicker materials such as plywood, available in two sizes for materials up to 6mm thick and 12mm thick, please choose option 
6mm long £3.15
12mm long £3.40
 
UK Made