Description: Superior Traction: Our stainless steel spikes provide traction, even on wet lawns or uneven terrain. Say goodbye to slipping and sliding! High Quality: Made from high-quality metal, our spikes are built to last. Each set includes 18PCS screws for easy installation. Easy to Install: Simply center the spikes on your robot mower's wheels and attach with the included screws. You'll have a beautiful, lawn in no time! Wide Compatibility: Our spikes are designed to fit a variety of models, For HUSQVANA 330 420 430 435 440 450 550. Improved Performance: With traction wheels, your robot mower be to handle even the toughest terrain. Enjoy a perfectly manicured lawn with less effort and hassle. Material: Metal Color: As shown Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Package Contents: 2 x Traction wheel anti slip nail 18 x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.