试看20分钟大片视频

试看20分钟大片视频:Travelling Block

试看20分钟大片视频:


试看20分钟大片视频:Features:

The sheave grooves are intermediate frequency quenched so that the surface hardness will be improved and the service life will be extended.

? The side plate assembly is made of thick steel plate, with enough strength.

? The sheaves and the bearings are interchangeable with those of corresponding crown blocks.

? Quenched and tempered alloy steel shaft with lubrication hole of each bearing.

? The travelling blocks are in accordance with API Spec.8C and API monogram can be used.

copyright ? 2021 试看20分钟大片视频 . ALL RIGHTS RESERVED 沪ICP备08116516号-1

试看20分钟大片视频-试看20分钟做受视频-免费试看二十分钟大片