... m46 1. used in the springs and frames connection for mattress, sofa,car seats . 2.logo can be design. 3. ... They are mainly used in the connection between the spring of mattress\sofa and rim..We are the factory of Specialize in ... all kinds of clips for the mattress as clips (M46,M45,M66,M65,M85),C-RING ( ... specifications, I hope happy! HIGH QUALITY CLIPS of M46(mattress used)