- 1). Cut 9 inches of steel tubing using your hacksaw to create the bars that connect your dumbbells' casing together.
- 2). Place two empty coffee cans at the bottom of the drying rack and drill holes in the middle of each can using your electric driller. See to it that the size of the holes is big enough to insert the bars of your concrete dumbbells.
- 3). Insert the steel tubing or bar in each can and allow the support grooves of the drying rack to hold the bar in a level and vertical position. This will ensure that you position each can levelly on either side of your dumbbells.
- 4). Mix a proportionate amount of concrete with water according to the instructions at the back of the concrete mix's bag. Place the in a mixing vat and blend them thoroughly using a stirring rod.
- 5). Place the cans on a weighing scale, while maintaining the position of the steel bar through its holes. Pour enough mixed concrete into each can to achieve your desired weight for the dumbbells.
- 6). Allow the concrete to dry for 24 hours in order to allow the concrete to solidify and grip onto the steel bars inserted through the can.
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