The newly redesigned IRWIN Accessory Storage Cases are visibly better. They have clear lids for easy viewing of content and are stackable for easy traveling and storage. They feature a patented bit-bar design for easy bit removal and customizable assortments of the wood drill bit set.The new SPEEDBOR Spade Bits now last 2 times longer and cut 2 times faster on average vs IRWIN SPEEDBOR prior generation in 1-3/8-inch Oak. The drill bit sets are designed with chamfered cutting edges for durability and feature a patented Blue-Groove design for chip removal.