Corner Guides are designed to withstand a 10,000 lbs. working line load with a 3:1 safety factor.
The installed sheaves are cast from 356-T6 aluminum, machined for correct balance and fitted with heavy duty, self-lubricating SAE863 iron-bronze bushings. The Corner Guides also have a wide base for stability, a deep lip for hooking into the manhole and two locations for hold down bars.
