圆钻形穿孔器 formed perforator

圆钻形状 Round diamond shape

圆弧形钻头 round-arc bit

圆形钻杆 round drill rod

圆盘形扁钻 [机] rotary disk bit

圆形骨钻 Rotating drill

非圆形钻石 Fancy-Shaped Diamond

圆形钻井振动筛 circular shale shaker

半圆形木钻 [木] dowel bit