Secures 2 wood members forming a 90 deg (degree) corner to a vertical post. This product is ideal for the construction of workbenches and storage shelving units. 18-gauge galvanized steel. Some sizes available with ZMAX coating. No RTC2Z: Install with 6-sd8 x 1-1/4" on post and 6-SD8 x 1-1/4" on joist or 6-SC9 x 1-1/2" on post and 6-SD9 x 1-1/2" on joist. No. RTC22Z: Install with 5-SD8 x 1.25" screws on post and 6-SD8 x 1.25" screws on joist. No. RTC42: Heavy-duty. Install with 14-SD8 x 1.25" screws on post and 11-SD8 x 1.25" screws on joist or 14-16d nails in post and 8-10d x 1-1/2" nails in joist.