Pack of 100 Groz-Beckert Leather Sewing Needles for Walking Foot Machines. Leather needle has the shape like a wedge at the point which gives it superior piercing power for unyielding fabric such as real leather, suede or heavy vinyl. This needle makes a clean, large hole as it enters the fabric. It is better to tie or seal thread ends rather than backstitching to secure. Sew accurately since removing stitches and restitching will leave hole markings. Synthetic leathers and suedes can and should be sewn with standard needles. Needle system* : 135X16TRI, DPX16D (Cutting point with a triangular cross-section. Suitable for hard, dry leather. ) These leather point needles fit sewing machines that use 135X17 (DPX17) system needles. These needles are identical to 135X17 regular point needles except for the leather point. *A needle system is a group of needles made to fit specific sewing machines. All needles in a system are of the same length and shank size, but are of various diameters. Lower size numbers are narrower or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier materials. Match your needle system to your machine, then the size of the needle to the product you are sewing. Groz-Beckert 135X16TRI point leather needles are available in following sizes. Lower size numbers are narrower or thinner needles used for lighter materials. Higher size numbers indicate a needle of thicker diameter, used for heavier materials. Match your needle system to your machine, then the size of the needle to the product you are sewing. Please select your size : Singer Size 18 (Metric Size 110) Singer Size 20 (Metric Size 125) Singer Size 21 (Metric Size 130) Singer Size 22 (Metric Size 140) Singer Size 23 (Metric Size 160).