The CM 4 1/2 T (44kN) powder coated shackles in combination with the 2 x 30kN MBS DMM rings is slick! Everything is extremely smooth and perfect for slacklining in the park or hundreds of meters in the air. The first rule is looking good, and this line locker is beautiful! The large diameter rings easily allow either the single and double wrap locker. The screw pin shackle style is easy to use and the CM shackle is the strongest steel shackle sold by SlacklifeBC.