Smooth, without burr. Safe to use, do not scratch your hands and countertops 324 holes in total. Our knitting board comes with 4 pin 5.86inches long. Enough for your knitting need This is a useful tool for making granny square, make look pretty and easily attach for larger project The crochet blocking board is perfect for those who enjoy the fun of crocheting The blocking board measure about 19.8x19.8cm/7.79x7.79in and stand base measure about 8.9x9.9cm, perfect for crocheting and knitting