... have two size(JWB and JWM)- please check our detailed instructions Technical data:1,lifting power:1.98-980(kN)2 ... with precision worm vice. 1, price economy, compact structure, simple operation, maintenance is convenient. 2, low speed, low frequency: mainly used ... speed has been greatly improved, can relaxed and high speed operation. 3, long service life: using high quality ball screw, make ...