precision CBH EWN boring head EWN20 EWN25 EWN32 EWN40 EWN150 EWN203 adjustable boring tool holder bore CKB1 2 3 4 5 6 LBK 1-6
precision CBH EWN boring head EWN20 EWN25 EWN32 EWN40 EWN150 EWN203 adjustable boring tool holder bore CKB1 2 3 4 5 6 LBK 1-6