MrCool M14SR4260 HVAC Accessories Square To Round 14 Adapter Kit | H14" X W14.5" 4 LbsMRCOOL M14SR4260 Mrcool M14SR4260 The Square to Round 14 Adapter Kit is a reliable solution for any engineering project. It converts square tubing to round tubing, fastening from one side. The kit is constructed from high grade steel and provides long term durability and strength. It ensures a secure and efficient fit with no air leakage and is ideal for any project. Metallic color finish. Signature Square to Round Series. Proposition 65 Warning.