【Easy Installation】 Pressure installation, no drilling, no damage to windows and walls. The reaction force between the child proof window guard and the contact surface is used for sturdy support, just need adjust the length of the four bolts to control the tightness of the child safety window guard. Disassembly can be done easily and simply by adjusting the tension of the bolts. 【Details Design】 The silicone of the adjusting bolt adopts a thread design, which increases the friction between the kids tensioned window guards and the contact surface. The diameter of the small hole at the bottom of the inside winding window guards is 0.197inch, which can effectively prevent the babies from inserting their fingers while playing. The surface of the extra wide proof window safety guards have been painted, is smooth without burrs to prevent the baby from being scratched. 【Security Guarantee】The gap between the window safety guards for children is 2.68 ", and it is impossible for a child to fall through the gap. The safety window guards had been tested and it can withstand 220 pounds of pressure and 110 pounds of impact.Using brutal pull with force can't remove the pets safety window guard casement unless you are the Hulk. 【Occasions】The window safety guards for children suitable for 31.50"-86.62" windows, there are four sizes of 31.50 "-36.22", 36.22 "-61.42", 61.42 "-86.61", 86.61"-118.10" for choice. Suitable for flat window, fixed window, bay window, sliding window, removable sliding window, etc. 【100% Satisfaction Guarantee】As a quality seller, we are responsible for every product. If you are not 100% satisfied with the window guard，we offer a 30-day money back guarantee and life time replacement for defective items. Kindly Remind: Before installation, you need to prepare a Phillips screwdriver in advance to use when splicing the window guards.Any problem about the item, please do not hesitate to contact.