Dependable and Resistant Build - No matter what sort of ground youre attempting to use this ladder feet on, your safety is ensured thanks to its aircraft-grade aluminum construction. Not only does this offer super strength and stability, but the ladder feet replacements also have rubber pads to prevent slippage. For Most Werner Extension Ladders - Extension Ladder Feet Fit on the Following Model(s): D1200-1 Series (Mk 15 & Mk 16)/ D1218-1, D1220-1 (Mk 14 - Mk 18)/ D1200-2 (Mk 15 - Mk 21)/ D1300-2 Series (Mk 7- Mk 12)/ D1700-2EQ Series (All Mk)/ D1800-2EQ Series (All Mk)/ D8220-2EQ Series