Can be used vertically as a plumb bob - Weight and style combination provides “Plumb Bob” utility Rubber over moulded case for strength and better grip High impact ABS case for durability 3.5 to 1 gear ratio - rewinds 3 x faster Patented chalk view window to see exactly how much chalk you have left Metal crank folds into the case for ease of storage Sliding door for quick and easy refill Stainless steel end hook for added durability and rust prevention Large 45g chalk capacity to reduce refilling times