Freely adjustable width up to 5-1/2". Fit on brick, block, fencing and more Secure gripping power, strong enough to hold long courses The string notch securely holds line in place by quick course changes for vertical or horizontal line holding The ergonomic design with rubber handle provides comfort to hold Advanced forging technology for high hardness, not easy to break Goldblatt RED 1 Pair XL JAG Clamp, Mason Line Clamps, Adjustable Brick Laying Tools for String Line