description walk behind power trowel to function properly, power trowels must maintain a precise perpendicular relationship between the gearbox's output shaft and blade arms. once the relationship is compromised, the trowel will vibrate and/or wobble. mbw had gone to great lengths to maintain this critical relationship. mbw walk-behind power trowels feature the industry's heaviest bearings, output shafts, gears, spiders and blade arms. comparison of these critical mbw components to those of any competitor answers the question as to why mbw trowels run so well for so long. california proposition 65 warning. specifications acme tools brand name mbw acme tools part number 464169 assembled weight (lbs) 5.0 california proposition 65 warning required yes globaltradeitemnumber (gtin) 00400641000191 package weight 6 package weight (lbs) 6 upc 400641000191