DeWalt 323711-10 O Ring19 X 3.5 For

The O'ring 19 X 3.5 is a genuine replacement part from DeWalt/Black & Decker specifically used in various DeWalt and Black & Decker models, such as :
SDS Rotary Hammer Drills : D25404K, D25405K, D25501K, D25553K, D25601, D25603K, D25651K, D25851K, D25601K, D25831K, D25652K, D25851K etc
Chipping and Demolition Hammers :DW540, DW541, DW543, DW545, DW568K 
ELU: SH50E, BH32EK, BH40, BH41, BH41E, BH45, BH46E etc

Physical Dimensions:
Inner Diameter: 19 mm
Cross-Section (Thickness): 3.5 mm