Omega Technologies ATBR3137 Hi-Lok 5/16” x 3/8” Flat Box Ratchet is perfect for installing Hi-Lok® fasteners, Hi-Lok® flat box ratchets from Omega Technologies are made of high quality, heat-treated steel and finished with a nickel-chrome plating. The result is a durable, long-lasting tool. Small size and variable shape make the Hi-Lok® flat box ratchet ideal for use in tight areas. Even without line of sight, the head fits easily onto a collar, while the shoulder ring prevents the collar from slipping though the socket. Hi-Lok® Flat Box Ratchet are durable, perfect for tight areas and have a shoulder ring inside the socket.