The SMB K Box is a 1 1/8" sector, Short shaft, 4 Turn Box (The 3 3/4 Turn is a Misprint), all SMB K, SMB E, are 4 turn. Turn the Box, all the way from left to right, it will turn 4 Turns if a True SMB K. If it turns 5 Turns, it is a SMB D Box, wrong tag.
Difference between 4 turn, E...