■特点：
☆A型：卡盘配带梳齿型硬卡爪。
☆B型：卡盘配带十字键型软卡爪。
☆C型：卡盘配带梳齿型软卡爪。
☆A—C型：卡盘配带梳齿型硬卡爪和软卡爪各一副。
■Specificity:
☆Form A：Matched with hard top jaws with serrations.
☆Form B：Matched with soft jaws with cross tenon.
☆Form C：Matched with soft top jaws with serrations.
☆Form A—C：Matched with each set of hard top jaws and soft top jaws , with serrations.