Series Features • Molded ABS Plastic GT-300PB • 6.125” x 7.688” • Standard 1.375 x 18 TPI • Compatible with GT-400CD & GM-500CD drivers  GM-400PB • 4.313” x 10.5” • Standard 1.375 x 18 TPI • Compatible with GT-400CD & GM-500CD drivers     MORE >>