niceeshop(TM) Universal Knitting Aluminum Crochet Lite Large Pin (Random Color,Set of 4) Material:Aluminum;Size:22cm(8.66"),15cm(5.9")11cm(4.33"),9cm(3.54) 4 different size safety pins to hold stitches that will be knitted together. Allows work to be knit off onto a lockable stitch holder For re-starting work on the project,just slip the stitches back onto your needles.