These are more than just stair gauges.. these jigs are made out of anodized aluminum, making them lighter than the standard brass gauges even though they are 3x as big. They knurled screw makes it easy to tighten down even when working with gloves on. Common uses include: - Stair layout - Rafter layout - Rip guide on your circular saw - Framing square attachment - Using on speed square to mark repetitive angles - Using on speed square to guide your saw to make angle cuts ?Material?: Made of anodized aluminum with a black oxide stainless steel thumbscrew,tough and durable. ?Functions?: Stair stringers and Rafter layout - Rip guide for circular saw - Framing square attachment - Using on speed square to mark repetitive angles - Using on speed square to guide saw to make angle cuts. ?Non-slip?: The large knurled thumbscrew makes it easy to grip and tighten onto any rafter square even when wearing gloves.your work piece, giving you a seriously accurate layout. ?Accuracy?: The Taller Profile extends down past any rounded edges for defects on your work piece, giving you a seriously accurate layout. ?Efficient??Align them with the specific ruler marks on the frame square, the ruler marks can be seen through the concave cut when the gague is fully inserted,increase visual field area.Glides smoothly against your work piece when marking repetitive cuts.