extension socket meaning in English

拖苏板；拖板
延伸套筒

Reduction sleeves and extension sockets for tools with morse taper shanks
莫氏锥柄刀具用异径连接套和接长套筒
Reduction sleeves and extension sockets for tools with morse taper shanks - dimensions
莫氏锥柄刀柄用缩减管套和延伸套筒.尺寸
Machine tapers - specification for reduction sleeves and extension sockets for tools with morse taper shanks
机用圆锥.第2部分:莫氏锥柄刀具用锥形套和加长套筒规范