Needles > 135x17 DPx17
Schmetz 135x17 SY3335 DPx17Sewing machine needles to fit industrial walking foot machines. These needles are designed to punch through canvas and the heavier materials. Size is the diameter of the needle. The bigger the size, the bigger the hole that is made.
12-18 (80-110) - Lighter leather/canvas
19-23 (120-160) - Standard material - most common size: 140
24-25 (180-200) - Heavy leather, multiple layers of canvas