The Scotty Anchor Lock is designed to be used with one hand. Pull back on the rope to release the rope locking mechanism and let the rope slide through your fingers. When the anchor has reached your desired depth simply lower the rope and the locking mechanism automatically engages...ingenious! Can hold an anchor up to 20 lbs. Mount Dimensions: 4" x 2" x 2" Bolting Dimensions: 1 5/16" x 3 3/16"