3R-OK and 4R-OK
3R-OK has three rolling rings inside.
4R-OK has four rolling rings inside, which supplies double thrust force of 3R-OK.
OK-A and OK-C
OK-A is only a traverse box and OK-C is a to
3R-OK and 4R-OK
3R-OK has three rolling rings inside.
4R-OK has four rolling rings inside, which supplies double thrust force of 3R-OK.
OK-A and OK-C
OK-A is only a traverse box and OK-C is a to
