Solid Steel: Machined from a solid steel billet with no rivets or seams BIGBearing: We use a larger bearing for longer life - Snap-ring design allows for easy bearing replacement Fits Lazer Z Models: LHP4418KC LHP4818KC SN160000-319999, LHP4417KA SN160000-509999, LHP4819KA SN190000-599999, LHP4821KA SN220000-509999, LHP4419KA LHP4820KC LHP5220KC LHP5223KA LHP5223KC SN220000-599999, LHP4420KC SN320000-509999, LCT4418KC LCT4818KC SN370000-509999, LCT4819KA LCT5219KA SN440000-509999 Fits Lazer Z Models: LCT4418BV LCT4818BV LCT5218BV LHP4823KA SN510000-599999, LHP20KC505 SN600000-669999, LHP19KA505 SN600000-719999, LCT21BV523 LCT23BV603 LHP19KA465 LHP23KA505 LHP23KA565 LHP27KC505 LHP27KC565 SN600000-789999, LHP23KA465 SN670000-789999, LCT23BV523 LHP19KA465CA LHP23KC523 LHP27KC523 SN720000-789999, LZA27KC604 LZAS27KC604CA SN820000-919999, LZZ34KC606 LZZ34KC726 LZZ38KC606 LZZ38KC726 SN850000-919999 Fits Lazer Z Models: LZA20KAS484 LZA20KAX484 LZA20KAX524 LZAS22KA484 LZAS22KA484CA LZAS23KC524 LZAS25KC604 LZAS26LKA604 LZAS27KC524 LZAS27KC524CA LZAS27KC604 LZAS29KA724 LZZ23KC486 LZZ23KC526 LZZ24KA526 LZZ24KA526CA LZZ27KC526 LZZ27KC526CA LZZ27KC606 LZZ27KC606CA LZZ29KA606 LZZ29KCE606 LZZ34KA606 LZZ34KA726 SN850000-919999, LZE20KA484 LZE22KA484 LZE24KA524 LZS22KA484 LZS22KA484CA LZS23KC524 LZS24KA524CA LZS27KC524 LZX23KC486 LZX24KA526 LZX24KA526CA LZX27KC526 LZX27KC526CA SN920000-999999 HD BIGBearing Billet Idler Pulleys are machined from a single piece of solid steel and use a Larger Replaceable Pulley Bearing. Seamless Billet Pulleys provide superior durability, precision, and increased belt life. We use a larger bearing to increase life; and our billet pulley design makes it possible to replace the bearing if it fails. Designed specifically for heavy-duty applications, these pulleys offer the absolute best replacement option.