Fat Max chalk line set with 30m 100ft chalk line and 113g blue chalk 50lb breaking strain on line for longer life Rubber over moulded case for strength & better grip High impact ABS case for durability Sliding door for quick & easy refill Metal crank folds in to the case for ease of storage Clutch allows line extension without crank rotation Stainless steel end hook for added durability & rust prevention Patented chalk view window to see exactly how much chalk you have left 35 to 1 gear ratio rewinds 3 x faster Can be used vertically as a plumb bob