Set of No. 3 Dunelt economy tools, size: one No. 3 tool holder; one No. 3 tool cutter; one No. 3 tool gauge; one R.H. socket & blade; one L.H. socket & blade; one boring bar and 4 boring bits. Patented in the UK, 1915 (No. 4106)

Set of No. 3 Dunelt economy tools for metal-turning. Patented in the UK in 1915, the design of this cutting tool for use in metal turning reflected a desire for greater economy and lower cost in the processes involved. The tool was marketed as having better cooling properties compared to others, which gave better cutting efficiency.