Product Name : Multiuse Blocking Board With Steel Pins, 19Cm, Granny Squares, Crocheting, African Flower, Baltic Birch, Knitters Gift, Knitting Tool You can easily finish your knitted or crocheted patches with Kainor's Blocking Board! The Blocking Board is made of Finnish birch plywood and it's a handy aid for finishing knitted or crocheted patches. For example, blocking Granny squares or African Flowers into their shape can be done easily with the help of the board. Connecting the blocked patches to each other is easier and the work becomes neater. Holes are located 1cm apart so you can block any shape, even round ones. The set includes a 19.5cm x 19.5cm Blocking Board and 10 pcs of 5cm long galvanized nails. The nails are pushed from below into the Blocking Board and they stay firmly in place in this 6mm thick plywood board. Zinc plating prevents nails from rusting.