Jerk Blocks - Stackable 8pc setIndustrial Athletic Jerk blocks create a solid base at different heights, in order for an athlete to position a barbell to key heights to assist in Olympic or strength lifts. These blocks are stackable and constructed from a high quality 18mm thick plywood. Some of the best features include CNC machined parts and strategically aligned inserts for a great stacking fit. All top plates are also double walled for integrity and strength. We've used tech