HEAVY-DUTY DURABLE - 57kg load capacity per castor; Our gate castor has been designed to support the weight of wide metal and wooden gates as well as garage doors weighing up to 57kg IDEAL FOR USE ON UNEVEN SURFACES - The castor is mounted on a spring that allows the height of the wheel to adjust automatically as it rolls over uneven ground, keeping the gate at an even height 360 SWIVEL - With a 360-degree swivel design, for use on left or right-handed gates; It allows the castor to move and rotate to any direction and over unsteady terrain EASY TO INSTALL - It comes with 2 pre-drilled fixing holes so you can affix it quickly and easily to your gate/door MEASUREMENTS - 101mm rubber wheel, 145mm stem, 94mm fixed spring section, 51mm absorption movement HEAVY-DUTY DURABLE - 57kg load capacity per castor; Our gate castor has been designed to support the weight of wide metal and wooden gates as well as garage doors weighing up to 57kg IDEAL FOR USE ON UNEVEN SURFACES - The castor is mounted on a spring that allows the height of the wheel to adjust automatically as it rolls over uneven ground, keeping the gate at an even height