Karcher BDS 51/175-300 C, 20" Single Disc Floor Machine, Dual-SpeedDescription The Karcher BDS 51 175 300 C delivers professional grade durability and performance. This 20 inch machine offers both dual speed and single speed options and is constructed with cast aluminum housings for superior durability compared to standard materials. Enhanced with a new cord strain relief system to prevent damage, it also features a mechanical safety interlock to avoid unintended start ups and a built in circuit breaker to safeguard