With our new Steel Riveting Block, there is no more guesswork on the length of wire to be cut. The holes on the right are about 1.8mm deep, thus every cut is just the right amount of wire needed to create head" on both sides. The middle row of dimples are for support on riveting in order to hold the shape of the rounded rivet head. The circles on the left side are for riveting Eyelets in 3 different sizes without flatting the rounded rims. Dimples on the side of the block are for rivets. On the opposite side, the circles are for Eyelets for CURVED surfaces. Please note: the block has to be mounted on the vise for this procedure.