Jack adapters for 20 ton bottle jacks slip over the ram of typical 20 ton bottle jacks(2.25") and then couples to the standard jack ram extensions (1.25" diameter). This is an easy way to extend the reach of 20 ton jacks without having to pile blocks and cribbing under the jack. The combination of adapter and extensions is far safer than a jack and cribbing because all the parts are connected. Even if things shift, the jack and extensions remain securely together. For additional security, use special jack pads against the load.