The “Spool” is designed to keep the load centered on the pin, thus keeping the sling positioned correctly in the shackle bow.

Elephant QBT Quick Beam Trolley
Capacity Range: 1t ~ 10t Heavy Duty Quick Install Push Type Trolley Simple Installation, No Special Tools Required Fits both ‘S’ beams and ‘W’ beams Low Profile Design Corrosion Resistant Stainless Steel Plungers Corrosion Resistant Double Sealed Bearings Meets...