supply of single sleeve pulley block 3single sleeve pulley block 3,single sleeve pully block 3 1/2 x 1/2 fiber groove fiber with forged swivel hook for drawal of contact/catenary wire. make: sste, maxban, iep,venus. [ warranty period: 30 months after the date of d elivery ] ] , single sleeve pulley block 3 1/2 inch x1/2 inch groove steel. the complete block including he ad fitting shall withstand a proof load equal to twice the safe working load (swl) capacity 2.0 ton. confirm to is 1875-1992. make- s.s.t, iep, or similar (with load test certificate from govt. lab). [ warranty period : 30 months after the date of delivery ] ]