Transom Mount TransducerSingle/Dual Beam, 20/60 Degree, 200/83 kHz, 20' Cable. More secure, especially at high force of waves. Improved running angle and an optional lock down screw to override the kick up.For Use With: 141C 161 323 325 343C 345c 363 365i 383C 385ci 515 525 535 550 560 565 570 575 580 581i Combo 585C 586C 587CI 595C 596C 597CI 717 718 727 728 737 747c 757c 767 768 777c2 778C 785 c2 787c2 787c2I 788C 858c 931C 937C 957c 958c 1157c HDR 610 MATRIX 10 MATRIX 12 MATRIX 15 MATRIX 17 MATRIX 20 MATRIX 25 MATRIX 27 MATRIX 55 MATRIX 65 MATRIX 67 MATRIX 77C MATRIX 87C MATRIX 97 PIRANHA 1 PIRANHA 2 PIRANHA 3 PIRANHA 4 PIRANHA 5 PiranhaMax 10 PiranhaMax 15 PiranhaMax 150 PiranhaMax 160 PiranhaMax 170 PiranhaMax 190C PiranhaMax 20 PiranhaMax 210 PiranhaMax 215 PiranhaMax 220 PiranhaMax 230 PiranhaMax 240 PiranhaMax 30