【Sturdy Construction】--Made of high-quality steel with spray paint, the pin type car jack stands provides stable support for trucks and RVs. The heavy duty steel frame,with a maximum load capacity of 44,000LB, can secure the lifted vehicle during transmission pulls or axle repairs. 【Adjustable Height】--Equipped with 5 holes on the support tube, The car jack stand can be adjusted from 11'' to 18'' according to your needs. Height adjustment pin connected to base by way of lanyard to prevent against loss. Spring-loaded quick-release pins positive locks instantly. 【Fail-Safe Load Engagement】--Locking pin jack stands utilize automatic lever-lock technology: lifting the handle adjusts saddle height, lowering it engages triple-bolt security. Locating lugs grip axle tubes while bases prevent sinka.