XtremepowerUS 158pc Electrical Wire Connection Screw Twist Connector Cap w/Spring Insert Assortment Kit Maximum voltage: Gray, Blue, Orange:300; Yellow And Red: 600 Grey - Min. 2x#22 Max. 2x#16 (40 pc), Blue - Min. 2x#22 Max. 3x#16 (40 pc) Orange - Min. 1x#18/1x#20 Max. 4x#16/1x#20 (50 pc), Yellow - Min. 2x#18 Max. 4x#14/1x#18 (18 pc) Red - Min 2x#14 Max. 2x#10/2x#12 (10pc)