Single Line Mill Scale Buckets Application: Hawco single line mill scale buckets are intended for use in steel mills where they can readily be hooked to overhead cranes to clean out mill scale pits. These buckets are of a rugged, heavy duty design and will offer many years of service. Sizes: .5 to 2 _ cubic yards. Standard Features: All alloy steel construction. Pins and bushings made of heat treated 4140 and 4150 alloy stock. All pins and bushings are lubricated through recessed grease fittings. Sheaves are cast of alloy steel and fitted with 9C aluminum bronze bushings. Oversized guide rollers for less cable wear Lip material is T-1 alloy.