... ,34mm,36mm,38mm 3)solid and hollow bar adjustable swivel screw jack base we can offer the products to you as per your ... Price Prompt Delivery Quality Approvals Small Orders Accepted1)name: swivel base screw jack 2)material:Q2353)ODsize:28mm,30mm,32mm,34mm,36mm,38mm4 ... volume, long lifespan,good fastening and antislip capacity, first choice for scaffoldings building