Roger Strautman Chip Carving KnivesThe Roger Strautman chip carving knives use Helvie steel, but are handcrafted and sharpened by Roger himself. Roger makes his chip carving knife handles from a variety of beautiful exotic and domestic woods. Chip knife blades are approximately . 032 (. 81mm) thick, 9 16" to 7 8" long (variations, view specific photos), 1 4" wide. Handles are approximately 5 7 8" long. Stab knife blades are approximately . 055" (1. 397mm) thick, 13 16" to 1" long