Aluminum injection mold blanks for Diy plastic injection molding and benchtop injection molding machines.Precision machined to perfection these aluminum injection mold blanks are a great start to your DIY plastic injection molding machine project. These are a great fit for many benchtop injection molding machines as well as larger machines. Benchtop injection mold is precision machined aluminum With steel guide pins installed. Each half is 1/2" thick x 3" wide x 2 1/4" high