API 8C Oil Travelling Hook and Block for Oilfield Drilling Features: In accordance with API Spec.8C and marked with API MONOGRAM; The side plate assembly is made of thick steel plate; The grooves are quenched to extend the service life; Equipped with the rope covers; The bearings and the sheaves are interchangeable with those of matching Crown Block; Type Max. Hook Load Number of Sheaves Sheaves Outer Diameter Wireline Diameter Main Hook Opening Spring Travel Overall