These tripods are built to last with heavy construction throughout, and are designed to withstand rigorous field conditions. All Crain tripods have a durable powder-coated finish. Significant advantages in volume and efficiency enable Crain to not only offer superior tripods, but at the best prices. Introducing Extra Heavy-Duty Square Leg Aluminum Tripods These square leg tripods are extra heavy-duty with a rugged and durable design The 5/8 x 11 thread accomodates many instruments and is ideal for attaching lasers or optical levels.