Machine description: 320 LINKAGE PRO PLUS THUMB FOR USE WITH QC & 36" GDCBKT PN#552-8220 OR 48" GDCBKT 552-8222 HARD HIT MATCH, WOULD ALSO MESH WITH 42" GD, HD & SD BKTS, INCLUDES BRACKET AND BALL VALVE LINES, 2 TINES, 2... more info about the Caterpillar B PRO+THUMB.