lebus grooved sleeve used more and more popular now .as it can save the time and cost to replace the whole winch drum . as the constantly technical and research development ,our company now strongly produce the lebus series. that widely used in winch ,offshore platform ,drilling rig and other hosit ,lifting conditions . it can be design by us or by customer .if you have the intresting  pls contact us freely .We like to establish the good cooperation with you.