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Easy to mount.
Especially for unique workpiece, e.g. rectangle, flange…etc.
Stopper bolt can prevent master jaws departing from the body.
Replaceable for Japanese brands.
Standard product 6~10" made of high strength alloy steel SCM440 from Japan
Above 21 inches are made of FCD600.
Sliding surfaces, master jaws, and interior parts are hardening and grinding.