JIS Plain Linear Bearing FJ20 20mm Closed, Precision ID Open Linear Plain Bearing you can order the matching

you can order the matching 6mm wrench as part #6101227

Precision-Bored Aluminum Housing - Self-lubricating ID liner FrelonGOLD®

Straight outer diameter

The result is maintenance-free

Optional stainless steel shell for washdown or corrosion-sensitive use

JIS Plain Linear Bearing FJ20 20mm Closed, Precision ID Open Linear Plain Bearing you can order the matchingClosed shell plain linear bearing with a JIS 20mm ID, precision running clearance, durable green anodized aluminum shell, and a bonded self lubricating FrelonGOLD liner that facilitates smooth linear, rotational, or oscillating motion on round shafts in harsh conditions where contamination, vibration, shock loads, washdowns, temperature extremes, lubricant maintenance difficulties, or poor machine accessibility can make rolling element bearings harder