These cover clamps for swimming pool black fixation are made of plastic, with good hardness, strength and toughness, clamp very tightly, no rust, durable and not easy to break. Our pool winter cover clips come in 2 shapes, measuring approximately 4.7 (L) x 0.7 (W) x 0.7 (H) inches and 4.7 (L) x 1.3 (W) x 0.7 (H) inches. These winter pool cover clips are suitable for most permanent above ground pools or pools with metal railings, not suitable for inflatable pools such as soft side pools, inflatable pools and steel frame pools. Above ground winter pool cover clips protect your pool cover from strong winds and other harsh weather during the winter, and the combination of two shapes of pool winter cover clips keeps your pool cover securely attached to your pool all winter long. Installation details: You can put the male clip on the pool rail, then cover the pool cover, and finally put the female clip on the pool cover and male clip to achieve a solid effect. Our swimming pool black fixed cover clip can not only be used as a strong wind protection clip for winter swimming pools, but can also be used as a greenhouse film cover clip, household folder, sealing clip, etc. color: Black Material: ABS Package Contents: 60pcs pool winter cover clips(2 different shapes 30 each other)