3×13 mm Pan Head Screw for sKLICK, KLICKpro, METAL and UNO 30. One pack includes 500 pieces. The sKLICK requires one screw while the KLICKpro requires two. The METAL biscuit connector requires 2 short screws when used in the side grain of a board and the same for the UNO 30. If longer screws are required, we recommend using 3×25 mm Pan Head Screws.