[Universal Compatibility] Precisely engineered replacement blades compatible with all Luba & Yuka robotic mowers (LUBA 1000-5000 / LUBA 2 3000-10000 / YUKA 600-1500). Tested under ASTM F2944 standard for perfect fitment. [Smart 4-Sided Utility] Dual-hole design allows blade flipping and rotation. Get 4 cutting edges per blade 36 blades = 144 usable edges. [Vibration-Proof Security] Screws with threadlocker, washers, and safety varnish create triple-lock protection. Withstands 2000+ RPM vibrations. Color: Silver Material: Metal The colors of screws may vary between batches; color designation not accepted. Package Contents: 36 pcs blades 36 pcs screws 36 pcs washers 1 pair screwdrivers Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. Measurement allowance is +/- 1-3 cm.