Chicago Latrobe 57850 550 Series Cobalt Steel Jobber Length Drill Bit Set with Metal Case & 57714 150 Series High-Speed Steel Jobber Length Drill Bit Set with Metal Case. Product 1: Set of 29 jobber length drill bits includes inch sizes 1/16″ through 1/2″ in 1/64 increments. Product 1: Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials. Product 1: Gold oxide finish lubricates and provides wear resistance on ferrous materials. Product 1: Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging. Product 2: Set of 29 jobber length drill bits includes inch sizes 1/16″ through 1/2″ in 1/64 increments. Product 2: High-speed steel (HSS) provides hardness for wear resistance. Product 2: Black oxide finish reduces bit wear while promoting chip and coolant flow on ferrous material. Product 2: 118-degree conventional point for a range of drilling applications. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. We usually respond within 24 hours on weekdays. Thank you for shopping at our store.