These are the REAL planers the others copy. A little more in cost, a lot more in quality! Heavier gauge Stainless plate and Rounded corners track straight and run deep. Used to get any bait deep quick,when tripped fight only the fish not the weight. For optimum use, rig rod to planer,planer to a 50' to 75' shock cord of 50# to 100# mono; then a Ball Bearing Swivel then leader and bait. The Bigger the bait and the faster the speed, the bigger the Planer used.