description 1-3/8 in. square head for concrete vibrator designed with hardened steel, the wyco square head provides higher force levels, greater amplitude, longer wear, and unmatched reliability. the square head design provides 22% more displacement, and offers 20%-50% faster consolidation. california proposition 65 warning. features features a constantly changing vibration pattern provides 22% more displacement offers 20% to 50% faster consolidation is more effective in low-slump concrete than round heads designed with hardened steel, the wyco square head provides higher force levels, greater amplitude, longer wear, and unmatched reliability optional polyurethane coated heads to prevent rebar damage 720 lbs. of force @ 10,500 vpm width of vibration: 9 to 13 in. specifications acme tools brand name wyco acme tools part number w878-533 assembled weight (lbs) 5.4 california proposition 65 warning required yes color / finish silver country of origin united states globaltradeitemnumber (gtin) 00423878000017 handle length (in) 14.5 internal supplier part # w878-533 internet product code (ipc) d378a7a4bce manufacturer warranty one year limited manufacturer warranty. see owner's manual for details material hardened steel package contents square concrete head package quantity 1 package weight 7 package weight (lbs) 7 size 1.375 in. upc 423878000017 used with sure speed concrete vibrator width (in) 1.375