Here is a list of the MM gripper specs. I thought this would be helpful for anyone interested and anyone looking to get replicas from Tetting. MM1 Tetting Elite .295" Spring 1/4" Mounting Depth 2.75" Spread MM2 Tetting Elite .295" Spring 3/16" Mounting Depth 2.75" Spread MM3 Tetting Super Elite .306" Spring 1/4" Mounting Depth 2.75" Spread MM4 Tetting Super Elite .306" Spring 3/16" Mounting Depth 2.75" Spread MM