Raymarine B275LH-W Bronze Thru-Hull - Low & High Wide Frequency [A80322]B275LH W Bronze Thru Hull Low & High Wide Frequency Get more coverage under the boat with the wide beam CHIRP product line. Offering a high frequency range of 150 250 kHz and a constant 25 beam width, these transducers are truly broadband at its best. In addition to improving the performance of CHIRP ready echosounders, anglers using the new wide beam transducers will achieve twice the coverage under the boat compared to our current high frequency