[Universal Compatibility]Precisely engineered replacement blades compatible with ALL for 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 & rotation. Get 4 cutting edges per blade - 36 blades = 144 usable edges. [Vibration-Proof Security]screws with threadlocker + washers + safety varnish create triple-lock protection. Withstands 2000+ RPM vibrations Color: Silver Material: Metal The colors of screws in different batches, Not accepting designation Package Contents: 36pcs blades 36pcs screws 36pcs washers 1Pair screwdrivers 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.