Mason Line Clamps : With 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, it fits on brick, block, fencing and more. Besides, the L shape clamp head also fits woodworking jobs for wood clampings Mason Line : Made of nylon, sturdy and durable, the tensile force exceeds 130 lbs. The 8 braided thread mason line, built-in elasticity maintains tension, eliminates sagging. Also, it is abrasion and alkali resistant. The bright warm color is obvious to see, user-friendly in construction space Multiple Application : This 4 piece concrete tools set serves multiple purposes : crafting, home improvement, landscaping, construction, etc. The 2 mason line clamps act as good line stretchers. The mason line with elasticity and waterproof features perform well in measurement Package Contents : 2 mason line clamps, maximum opening scale : 2 inch, weight : 0.5 lb (225 grams)/PC; 2 mason line rolls, weight : 0.46 lb (207 grams) / PC, size : Φ1mm x 500 ft / PC. 4 tools are included in 1 box. You don’t need to spend more time and more money to gather tools. Time-saving and labor-saving