12MM SNAP-IN INSULATED SHAFT TYPE SHAFT STYLES MODEL L 15 17 20 25 30 41 R1241 R1271B R1271A a 4.85 7 7 8 12 12   b 5   10 12 12   c   　 7 10 12 12 　 MODEL L 10 12 15 20 25 36 R1231 R1272B a 4.85 7 7 8 12 12   b 5   10 12 12   c   　 7 10 12 12