Thread Size	Weight per 100 kg	Part Number
M6	0.04	SW-01
M8	0.1	SW-02
M10	0.2	SW-03
M12	0.2	SW-04

Material: Brass.  

Thread Size	Weight per 100 kg	Part Number
M6	0.04	SW-05
M8	0.1	SW-06
M10	0.2	SW-07
M12	0.2	SW-08

Material: Stainless Steel.