A pull-out test device up to 4 tons will allow you to perform an immediate pull-out test on an installed bolt: a measure of the specific bolt's ability in the soil designated for the project to withstand pull-out and withstand winds and constructive forces. The test is simple and immediate - and will help you choose the right bolts for your project. Do not compromise on a bolt that does not provide enough, nor do you invest in bolts with a higher capacity than required. The device will allow you to obtain approval from the engineer / constructor, and choose the appropriate bolt.