The Claas 0008356721 is an authentic OEM knot monitoring sensor designed for use in Claas QUADRANT series square balers. This critical component ensures accurate and reliable knotting operations, contributing to efficient baling performance. It is compatible with models such as QUADRANT 5200, QUADRANT 5300, QUADRANT 4200, QUADRANT 3200, QUADRANT 3300, QUADRANT 3400, QUADRANT 2200, and QUADRANT 3200 RC. Weighing 0.10 kg, this sensor is a direct replacement part for maintaining optimal machine functionality.