Redcat Racing 102049 Purple Aluminum Nylon Locknut M4 Qty 4 Compatible with: Caldera 10E, Caldera SC 10E, Caldera XB 10E, Lightning EPX, Lightning EPX Pro, Lightning STK, Lightning STR, Pagani, Pagani/Pagani Pro, S-TRYK-R, S-TRYK-R/S-TRYK-R Pro, Sandstorm, Sandstorm TK, Shockwave, Thunder Drift, Thunder EPX Drift, Tornado BB, Tornado EPX/EPX Pro, Tornado S30, Tremor Sg, Tremor St, Twister-XB, Twister-XTg, Volcano EPX/EPX Pro, Volcano MX, Volcano S30, Volcano STX, Volcano SV, Volcano T2, Vortex EPX/EPX Pro, Vortex SS Material: Aluminum 4 Pieces Included