Lifting Magnet Maximum Flat Load Capacity 330 lb Maximum Round Load Capacity 143 lb Minimum Thickness for Activation 1/4 in Minimum Thickness for Maximum Load Capacity 3/8 in Activation Mechanism On/Off Handle Magnet Length 3 3/4 in Magnet Width 2 3/8 in Magnet Height 2 3/4 in Overall Length 3 5/8 in Overall Width 2 1/4 in Overall Height 4 in Bail Inside Width 1 1/4 in Bail Inside Length 1 1/2 in Handle Length 5 in Minimum Operating Temperature -10 Degrees F