Marples blue chip b/edge chiselsMarples Blue Chip Chisels have high impact square section blue plastic handles, radiused for a comfortable gripter fitted blades are made from top quality carbon steel, hardened and tempered along the full length of the blade of 5s. 1/4, 3/8, 1/2, 3/4, and 1in. ( 6, 10, 12, 18, and 25mm): Bevel Edge.