Lifting Magnet Maximum Flat Load Capacity 660 lb Maximum Round Load Capacity 330 lb Minimum Thickness for Activation 1/4 in Minimum Thickness for Maximum Load Capacity 1/2 in Activation Mechanism On/Off Handle Magnet Length 6 in Magnet Width 4 in Magnet Height 4 in Overall Length 5 7/8 in Overall Width 4 in Overall Height 6 in Bail Inside Width 2 in Bail Inside Length 2 1/2 in Handle Length 7 1/4 in Minimum Operating Temperature -10 Degrees F