This H&L’s Cat style HL-1U3630 ripper Nosepiece is a replacement for Caterpillar’s 4.00” thick ripper on Model D10N and D9L Dozers. This nosepiece uses the H&L‘s R-500 Series tooth system, engineered and introduced by the H&L Tooth Company in 1981. H&L products meet or exceeds all OEM standards.