Universal Size 27 Diameter makes it suitable for more door knobs than any competing productPlease measure the doorknob before purchase otherwise it may can not be used Easy for Parents to UseAdults can easily open the child proof door knob covers with one hand but childproof door knob cover spins freely so tiny hands cant twist the door knob open Larger Side Holes The hole on the side of child safety door knob cover is larger than other child door knob covers so adults can easily hold the door knob without getting their fingers caught in it Durable No Easy to BreakThe toddler door knob cover is made of PP material safe nontoxic and harmless to children The thicker material makes the baby door knob safety cover durable and unbreakable and can be reused many times Easy to Install and Remove Safety door knob covers is simple quick to install Within just 30 seconds your home is childproof Easy for Parents to remove the kid proof door knob covers with screwdrivers