Guide to DIY with T-Slot Aluminum | Reef2Reef - REEF2REEF Saltwater and
Profile refers to the size/thickness of the T-Slot bar used. Common profiles are 2020 (20mmx20mm) , 3030 (30mmx30mm), 4040 (40mmx40mm) etc. Aluminum extrusion is very strong, and in most cases you will not need to build with anything over 3030. For example, a 36\" 3030 bar supported on 2 ends can support 3,573