All rudder / trim tab anodes have stainless steel allen screws. Stainless steel nuts are pressed in.
MODEL DIAMETER THICKNESS OF ONE-HALF WEIGHT BOLT SIZE HEX WRENCH OUR PRICE ADD TO CART R-1 1-7/8" 1/4" 0.3 lbs   #10 x 1" 5/32" $2.44 R-2 2-13/16" 1/2" 0.9 lbs   1/4" x 1-1/2" 3/16" $5.88 R-3 3-3/4" 1/2" 1.6 lbs   5/16" x 1-1/2" 1/4" $8.00 R-3H 4" 5/8" 2.6 lbs   5/16" x 2" 1/4" $14.42 R-4 5" 5/8" 3.2 lbs   5/16" x 2" 1/4" $16.26 R-5 5" 7/8" 4.5 lbs   5/16" x 2-1/2" 1/4" $24.02 R-7 6-7/8" 7/8" 9.2 lbs   5/16" x 2-1/2" 1/4" $40.49

Part Number Variations: R-1, R1, CAM R1, CAMR1, CMR01, CMR01S, MDR1, R-2, R2, CAM R2, CAMR2. CMR02, CMR02S, MDR2, R-3, R3, CAM R3, CAMR3, CMR03, CMR03S, MDR3, R-4, R4, CAM R4, CAMR4, CMR04, CMR04S, MDR4, R-5, R5, CAM R5, CAMR5, CMR05, CMR05S, MDR5, R-7, R7, CAM R7, CAMR7, CMR07, CMR07S, MDR7, CMR1, CM2, CMR3, CMR4, CMR5, CMR7, RB-XS, RB-S, RB-M, RB-L, 252561, 110304, 217919, 291823, 201204, 593618