试看20分钟大片视频

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.