Snail lock , 100 - 125 mm, M14
"Snail" slider for attaching abrasive or polishing disc.
SL is very popular because of the quick tool change.
D 100 mm M14: For the attachment of 100 mm discs.
D 125 mm M14: For clamping of 125 and 150 mm wheels
Alternative names for SL: bosh, sf, snail lock